Calulate two random numbers in flutter - random

Question

I'm trying to generate two different random numbers and add those together, but Flutter doesn't seem to like my math. I keep getting the message that '+' isn't defined for the class Random.
import 'package:flutter/material.dart';
import 'dart:math';
void main() => runApp(MaterialApp(
title: 'Random Numbers',
theme: ThemeData(primarySwatch: Colors.orange),
home: MyHome(),
));
class MyHome extends StatefulWidget {
#override
_MyHomeState createState() => _MyHomeState();
}
class _MyHomeState extends State<MyHome> {
#override
Widget build(BuildContext context) {
var num1 = new Random();
for (var i = 0; i < 10; i++) {
print(num1.nextInt(10));
}
var num2 = new Random();
for (var i = 0; i < 10; i++) {
print(num2.nextInt(10));
}
//var sum = num1 + num2;
return Container();
}
}
My goal is to display it something like this: "2 + 5 = "
where the user will fill in the answer. If correct do this else do that.

Answer 1

The error is telling you that you're trying to add two Random objects, and not two numbers. You're printing them correctly, using nextInt() on your loops, but when you try to sum them, you're using the original variable of the type Random.
Try this:
class _MyHomeState extends State<MyHome> {
#override
Widget build(BuildContext context) {
// Instantiate a Random class object
var numGenerator = new Random();
//You don't need a second loop because it was the same exact code,
//only with a different variable name.
for (var i = 0; i < 10; i++) {
print(numGenerator.nextInt(10));
}
// Save the numbers you generated. Each call to nextInt returns a new one
var num1 = numGenerator.nextInt(10);
var num2 = numGenerator.nextInt(10);
var sum = num1 + num2;
//use num1, num2 and sum as you like
return Container();
}
}

Answer 2

Thank you very much Gerorge and Sorry for my abscense.
I got some help to solve this through dart
Random seed = Random();
const int MAX_VALUE = 10;
int val1 = seed.nextInt(MAX_VALUE);
int val2 = seed.nextInt(MAX_VALUE);
int sum = val1 + val2;
print('$val1 + $val2 = $sum');